bell houseing run out - Moparts Forums

Register Log In Moparts Forums Moparts Question and Answer bell houseing run out

Print Thread

bell houseing run out #169049 12/16/08 11:37 PM 12/16/08 11:37 PM
Joined: Dec 2007 Posts: 155 calif C cupcake OP member
cupcake OP member C Joined: Dec 2007 Posts: 155 calif	im haveing a tough time with this even with off set dowels .i do,nt understand keislers math example 1 positive val +0.002 negative val -0.001 =0.003 example 2 neg val-0.003 = neg val -0.005 runout 0.002 any trick to this needs to be within 0.005

Re: bell houseing run out [Re: cupcake] #169050 12/16/08 11:53 PM 12/16/08 11:53 PM
Joined: Aug 2003 Posts: 2,469 Answering the call of the wild T ThermoQuad top fuel
ThermoQuad top fuel T Joined: Aug 2003 Posts: 2,469 Answering the call of the wild	I am assuming you have a dial indicator mounted on the crank securely and have it fixtured to move around the circle and repeat it's numbers. Be sure to have all the attaching bolts installed and torqued to the proper values to properly check runout. See attachment 4884142-runout.jpg (66 downloads)

Re: bell houseing run out [Re: ThermoQuad] #169051 12/17/08 12:31 AM 12/17/08 12:31 AM
Joined: Jan 2003 Posts: 4,285 Ohio 6 64dodge572 master
64dodge572 master 6 Joined: Jan 2003 Posts: 4,285 Ohio	If you want the bellhousing run-out to be within .005", then the total indicator reading can be no more than 2x that amount (.010"). EX +.007 / -.003, for a difference of .010". Keep in mind that there is around .003" clearance in the main brgs, so a perfect .000 reading is not possible unless you do all this with the engine dis-assembled. Hope this helps. -Dan- Brewers Performance Inc. 4-speed transmission and parts specialists PH 937-947-4416 or 937-698-4259 FAX 937-947-4419 www.brewersperformance.com

Re: bell houseing run out [Re: 64dodge572] #169052 12/17/08 05:28 AM 12/17/08 05:28 AM
Joined: Jul 2003 Posts: 2,344 Cincinnati, OH 6 6T6Cuda top fuel
6T6Cuda top fuel 6 Joined: Jul 2003 Posts: 2,344 Cincinnati, OH	Good point about the main bearings... The way I do it which takes more time, but makes everything make more "sense" is to rotate the engine a bit at a time and keep zeroing the dial indicator - do a full revolution of this. Then rotate the engine again and record all the readings at a few points in the rotation (I like to write them on the bellhousing with a sharpie); the max number is the amount of runout, if less them 0.010 then all is good, if greater then this divide this in 1/2 and get an offset dowel which is closest to this number (the 1/2 number) then install the dowel so it "points" to the maximum number - both dowels need to point in the EXACT same direction or your will not be able to get the bellhousing on. This is basically what the FSM saids but the first rotation is a pre step to make all the #'s positive - you can account for it, but it just makes life easier to read everything directly... MAKE SURE YOU HAVE A GOOD MOUNT for your indicator - if you rotate it and get different readings - it is not secured tight enough; do not use a mag mount - make a dedicated setup like the "special tool" FSM describes. Also, I have found almost every aluminum belhousing I have found has been twisted and needed to be milled "square" this will effect this measurement; applying all the belhousing bolts (including the "backwards") ones will effect the readings ESPECIALLY if the housing is twisted (as most used ones are). Just what I have found trying to align these things... 6t6

Re: bell houseing run out [Re: 6T6Cuda] #169053 12/17/08 07:48 AM 12/17/08 07:48 AM
Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O 70Cuda383 Too Many Posts
70Cuda383 Too Many Posts Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O	I did mine with a mag base, and getting repeatable numbers was a pain in the rump. I did the check probably 10 times and ended up taking an average of all the checks and got at least the direction I had to move, and the numbers were big enough I went with the .014 dowels. was it the right way to do it? nope. would I do it that way again? nope. but, at least it seems to be working as-is! Photobucket sucks

Re: bell houseing run out [Re: cupcake] #169054 12/18/08 03:37 PM 12/18/08 03:37 PM
Joined: Feb 2006 Posts: 227 Tennessee rj8806 enthusiast
rj8806 enthusiast Joined: Feb 2006 Posts: 227 Tennessee	Quote: im haveing a tough time with this even with off set dowels .i do,nt understand keislers math example 1 positive val +0.002 negative val -0.001 =0.003 example 2 neg val-0.003 = neg val -0.005 runout 0.002 any trick to this needs to be within 0.005 To put it more "plainly" with the dial indicator attached to the crank via the flywheel, the needle probe of the indicator should be resting on and in constant contact with the lip of the register hole opening. I like to start with the needle probe at the 12:00 position and the guage face at zero (0). Now, have a buddy roll the crank in it's normal direction(rotation) while you watch the dial indicator. You're looking for the maximum reading the dial indicator reaches before peeking and going back the other way. Let's say this occurs at the 4:00 position and the reading is .020", once you've completed a 360* rotation and verified that the maximum reading occured at the 4:00(our example) and it was .020, roll the crank around again until the needle reaches the 4:00 position again and is in fact .020". Now, zero out the gauge here at 4:00 and roll the crank until the probe goes 180* from it's maximum point(in this example the max was at 4:00 so 180* from that is 10:00). Whatever the gauge reads at 10:00 is your total indicated reading. Your run out is half of this number. This final number needs to be less than .005 to be in spec. If it is over that, then you'll need offset pins to correct it. By the way...I have had and seen alot of guys do this test and get a perfect .000. I myself got a perfect .000 on an install I did here in house, so it is possible. Richard Tech Support

Moderated by Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer

Hop To

Powered by UBB.threads™ PHP Forum Software 7.7.1